Submission #1026096

#	Time	Username	Problem	Language	Result	Execution time	Memory
1026096		socpite	Rail (IOI14_rail)	C++17	0 / 100	44 ms	860 KiB

rail

#include "rail.h"
#include<bits/stdc++.h>
using namespace std;

const int maxn = 5e3 + 5;

int distC[maxn], distD[maxn];

void findLocation(int N, int first, int location[], int stype[])
{
    map<int, int> mp;
    stype[0] = 1;
    location[0] = first;
    mp[location[0]] = 0;
    vector<pair<int, int>> vec;


    int fd = -1;
    for(int i = 1; i < N; i++){
        distC[i] = getDistance(0, i);
        // cout << distC[i] << endl;
        if(fd == -1 || distC[i] < distC[fd])fd = i;
    }
    cout << fd << endl;
    stype[fd] = 2;
    location[fd] = first + distC[fd];
    mp[location[fd]] = fd;

    for(int i = 1; i < N; i++){
        if(i == fd)continue;
        distD[i] = getDistance(fd, i);
        if(distD[i] < distC[i])vec.push_back({distD[i], i});
    }
    sort(vec.begin(), vec.end());
    set<int> st;
    st.insert(first);
    int mxid = 0;
    for(auto v: vec){
        int d = getDistance(v.second, mxid);
        int fakepos = *st.begin() + d;
        int lpos = *prev(st.upper_bound(fakepos));
        int checkdist = fakepos + location[fd] - lpos*2;
        if(checkdist == v.first && st.find(fakepos) == st.end() && getDistance(mp[lpos], v.second) == fakepos - lpos){
            location[v.second] = fakepos;
            stype[v.second] = 2;
        } 
        else {
            mxid = v.second;
            location[v.second] = location[fd] - v.first;
            st.insert(location[v.second]);
            stype[v.second] = 1;
        }
        mp[location[v.second]] = v.second;
    }
    st.clear();
    vec.clear();
    for(int i = 1; i < N; i++){
        if(i == fd)continue;
        if(distC[i] < distD[i])vec.push_back({distC[i], i});
    }
    sort(vec.begin(), vec.end());
    st.insert(location[fd]);
    mxid = fd;
    for(auto v: vec){
        int d = getDistance(v.second, mxid);
        int fakepos = *st.rbegin() - d;
        int rpos = *st.lower_bound(fakepos);
        int checkdist = rpos*2 - first - fakepos;
        if(checkdist == v.first && st.find(fakepos) == st.end() && getDistance(mp[rpos], v.second) == rpos - fakepos){
            location[v.second] = fakepos;
            stype[v.second] = 1;
        }
        else {
            mxid = v.second;
            location[v.second] = first + v.first;
            st.insert(location[v.second]);
            stype[v.second] = 2;
        }
        mp[location[v.second]] = v.second;
    }
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 22
• Subtask 3: 0 / 26
• Subtask 4: 0 / 44